Marie Blanche (Demourelle) Pitre lived in Louisiana.
Marie Blanche Demoruelle, daughter of Leon & Marie Adolphine Vidrine, was born March 24, 1885 in St. Landry Parish around Ville Platte.
Marie Blanche Demourelle married SIdney Pitre on December 20, 1906, in St. Landry Parish, Louisiana. 
Marriage: Leon Demoruelle & Adolphine Vidrine; 21 March 1883, Opelousas, Louisiana.
In 1900, Marie B Demoruelle is living with her parents and siblings in Ville Platte, St. Landry Parish. She is 15 years old.
Leon Demoruelle 41
Adolphine Demoruelle [Vidrine] 35
John A Demoruelle 16
Marie B Demoruelle 15
Anna Demoruelle 13
Louise C Demoruelle 11
A Hypolite H Demoruelle 8
Clemett Demoruelle 6
Gabriel Demoruelle 4
Joseph A Demoruelle 2
Eloi L Demoruelle 0
Sidney and Mary B Pitre appear in the 1910 census in Calcasieu Parish, Louisiana, with their son, Sidney. When the census was taken in May, he was recorded as 6/12 years old, or about 6 months, so he could have been born in late 1909. 
Sidney and Mary B. Pitre appear in the 1920 Census with their children Lawrence S. (age 10, presumably the very young Sidney L. from the 1910 census) in Police Jury Ward 5, Jefferson Davis, Louisiana, and sister, Esma (possibly Erma). 
In the 1930, Sidney appears listed as a widower with son with his son Lawrence, again in Police Jury Ward 5, Jefferson Davis Parish. Lawrence is listed as 20 years old. Sidney is age 46 and is listed as widowed. No Esma/Erma. [
↑ Source: #DJH CD
DEMORUELLE, Marie Blanche (Leon & Marie Adolphine VIDRINE) b. 24 Mar. 1885 (VP Ch.: v. 3, p. 345)
Source: DJH CD Title: Southwest Louisiana Records, 1750-1900: compact disk #101; Author: Donald J. Hébert; Publication: Rayne, LA: Hébert Publications, 2001; CD 101; copy in possession of Jacqueline Girouard
"Louisiana, Parish Marriages, 1837-1957," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKJH-15YK : 15 October 2015), Sidney Pitre and Marie Blanche Demoruelle, 20 Dec 1906; citing St. Landry, Louisiana, United States, various parish courthouses, Louisiana; FHL microfilm 870,700.
"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MPT2-4BQ : 29 October 2015), Sydney L Pitre in household of Sydney Pitre, Police Jury Ward 2, Calcasieu, Louisiana, United States; citing enumeration district (ED) ED 32, sheet 25A, NARA microfilm publication T624 (Washington, D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,374,523.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MV7M-GV7 : 14 December 2015), Lawrence S Pitre in household of Sidney Pitre, Police Jury Ward 5, Jefferson Davis, Louisiana, United States; citing sheet 8B, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,820,616.
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It may be possible to confirm family relationships with Marie Blanche by comparing test results with other carriers of her mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Marie Blanche: